Valve mechanism for regenerative furnaces.



L. N. MCDONALD.

VALVE MECHANISM Eon REGENERATIVE FURNACES.

APPLICATION FILED JULYIZ. 1915. V v 1,170,301, I Patented Feb. 1, 1916.

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WITNESSES: INVENTOR- y I I f I I V E v I ATTORNEY THE COLUMBIAPLANOGRAPH co WASHINGTON, D. c. I

L. N. McDONALD.

VALVE MECHANISM FOR REGENERATIVE FURNACES.

APPLICATION FILED JULY 12. I915.

1,170,301. l Patented Feb. 1, 1916.

2 SHEETS-SHEET 2.

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THE OLUMBIA PLANOGRAPH cm, WASHINGTON. D. c. v

LOUIS N. MoDONALD,-OF YOUNGSTOWN, OHIO.

VALVE MECHANISM FORREGENERATIVE FURNACES.

Specification of Letters Patent.

Application filed July 12, 1915. Serial No. 39,295.

To all whom it may concern Be it known that 1, Louis N. MCDONALD,

a citizen of the United States, resident of Youngstown, in the county of'Mahoning and State of Ohio, have invented certain new and usefulImprovements in Valve; Mechanism for Regenerative Furnaces, of which thefollowing is a specification.

The primary object of the present invention is to provide an improvedarrangement of valve mechanism for regenerative furnaces for preventingthe discharge of gas from the gas flue when the furnace is beingreversed, and may be embodied in apparatus of the general characterdisclosed in Patent No. 987,73, granted to me March 28, 1911. In thearrangement shown in that patent provision is had for closing the stackflue when the reversing valve is raised or opened for reversing itsposition. Vhile the location of the shut-off valve shown in that patentpossesses marked advantages,

there are certain other advantages which result from placing a similarlyoperating valve in the unburned gas or fuel supply flue. With the gasflow uninterrupted, considerable gas passes into the chamber during thereversing operation which escapes unconsumed to the stack as soon as thevalve has been completely reversed. With the gas flow shut off duringthe reversing operation this waste is prevented. Also, with the gas flowstopped while the reversing valve is being adjusted, the resulting heador accumulation of pressure in the gas flue has the effect of morerapidly filling the checker chamber when the gas is released, therebymore quickly establishing normal conditions within the chamber aftereach reversing operation.

In the accompanying drawings, Figure 1 is a sectional elevation showinga reversing valve of the Dyblie type applied to the flues of aregenerative furnace. Fig. 2 is a sectional plan on line 2-2 of Fig. 1,showing the arrangement and relative location of the several flues of aregenerative furnace.

Referring to the drawings, 2 designates a main gas flue leading from thegas producer or other source of gas supply, and 3 is the flue connectionleading from a reversing valve 1 to a stack flue 5. A flue connection 6is provided leading from the stack flue which connects to the air valvesof the regenerative furnace. The reversing valve 1 is employed toconnect the gas regenerator flues 7 and 8 with the gas flue 2 and inlet3 leading to stack flue 5. Flues 9 and 10 which lead, respectively, tothe air regenerators located at opposite ends of regenerative furnacesare provided with connecting flues 11 and 12 which are arranged in asuitable location relative to the air inlet 6 leading into the stackflue. A valve, usually of the Siemens butterfly type, is employed toconnect the flues 9 and 10 from the air regenerators with the inlet 6leading to stack flue 5. i

As illustrated in my former patent, a shutter or damper valve 13 islocated in the stack-connecting flue 3, the valve being mounted insuitable recesses or grooves in the opposite side walls of the flue soasto be slidalole in a vertical direction for opening and closing orshutting off the flue connection 3 from the flue 5.

The rotary reversing valve 1' of the Dyblie type is here shown employedto connect the gas and stack flues with'the gas regenerator 'flues. Asuitable turning mechanism is provided in which the first movementin thereversing operation is to lift the casing of the valve vertically inorder to raise the bottom marginal edge 4* of the partition in the valveabove the upper marginal edge of the water seal 14, the latter beingsupported by.

the masonry in which the vertically extending flue outlets are formed.

As here shown, a stemor rod 15 connects the casing of valve 4 with'achain or other flexible suspending means 16 secured to a lever 17 thelatter being pivoted intermediate its ends to any suitableoverhead'support such as bracket 19 depending from a floor 20, thelatter usually covering the valve pit commonly employed in connectionwith regenerative furnaces. The side of lever 17 to which'the reversingvalve is connected has its extremity counterweighted at 23, and alsoflexibly connected to that side of the lever is one end of the lever 17the latter suitably supported by bracket 19 depending from floor 20.Suspended from the free end of lever 17', as by chain 21 and rod 22, isvalve 13.

Similarly suspended from the free end of lever 17 by chain 21' and rod22 is valve 13 for the live gas flue 2. Valve 13 may be of the sameconstruction and mounted for vertical movement for closing and openingflue Patented-Feel, 1916.

2 in the same manner as valve 13 for the outlet flue. I

From the foregoing it will be seen that valves 13 and 13 close theirrespective flues simultaneously with the raising and opening ofreversing valve 4, and after the latter has been turned as required forproperly directing the live and burned gases it is lowered andsimultaneously therewith valves 13 and 13 are raised, thereby restoringthe several valves to position for maintaining normal workingconditions.

l/Vith the Dyblie valve 4; raised and opened as in Fig. 1, its positionwhen being rotated for the reversing operation, valve 13 is closed andthe flow of fresh gas from fiue 2 is stopped. After valve 4; has beenturned sufliciently to reverse its position, and thereby reverse theconnection between the gas flue 2 and regenerator flues 7 and 8, all asdescribed in my former patent, it is lowered, and by the same movementvalves 13 and 13 are raised and opened, thereby admitting fresh gas intothe new path established by the reversing valve and opening the new pathestablished by said valveto the stack. The coursing of the gases andproducts through the several flues is described in my former patent, andneed not be here repeated.

\Vith the flow of fresh gas shut off by valve 13 during the reversingoperation, there is no waste of fuel such as might otherwise ensue, forin the absence of such valve a considerable volume of gas mightaccumulate in the checker work that would pass unconsumed to the stackupon opening valve 18. WVithboth the gas inlet flue and the stack flueclosed, the gas remaining in the checker chamber will flow into thefurnace during the reversing of valve 41 and no waste will result, therebeing no opportunity of short circuiting to the stack, the stack draftbeing effective through the checker chamber for thus drawing the gasinto the furnace, thereby completely emptying the chamber and consumingand obtaining the benefit of the last portion of the gas flow whichotherwise would be wasted.

A further advantage of gas flue valve 13 results from the accumulatedhead or pressure of gas behind said valve which when the latter isopened immediately fills the checker chamber with which it is incommunication, thereby quickly restoring the gas flow and gasconsumption to normal conditions.

I claim:

In a regenerative furnace, valve mechanism comprising a reversing valveadapted to operatively connect the stack and gas fines with theregenerator flues, a valve for the gas flue, a valve for the stack flue,and means operatively connecting all of said valves and constructed andarranged to close the gas flue valve and the stack flue valve while thereversing valve is being operated to reverse the direction of flow ofgases.

In testimony whereof I atix my signature in presence of two witnesses.

LOUIS N. MCDONALD.

Witnesses WARREN F. PERRY, XW'ILLIAM C. DAMMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

